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LLVM backend for 6502
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d288259ccd
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Andrea Di Biagio d288259ccd [X86][AVX] Fix wrong lowering of v4x64 shuffles into concat_vector plus extract_subvector nodes. 
This patch fixes a bug in the shuffle lowering logic implemented by function
'lowerV2X128VectorShuffle'.

The are few cases where function 'lowerV2X128VectorShuffle' wrongly expands a
shuffle of two v4X64 vectors into a CONCAT_VECTORS of two EXTRACT_SUBVECTOR
nodes. The problematic expansion only occurs when the shuffle mask M has an
'undef' element at position 2, and M is equivalent to mask <0,1,4,5>.
In that case, the algorithm propagates the wrong vector to one of the two
new EXTRACT_SUBVECTOR nodes.

Example:
;;
define <4 x double> @test(<4 x double> %A, <4 x double> %B) {
entry:
  %0 = shufflevector <4 x double> %A, <4 x double> %B, <4 x i32><i32 undef, i32 1, i32 undef, i32 5>
  ret <4 x double> %0
}
;;

Before this patch, llc (-mattr=+avx) generated:
  vinsertf128 $1, %xmm0, %ymm0, %ymm0

With this patch, llc correctly generates:
  vinsertf128 $1, %xmm1, %ymm0, %ymm0

Added test lower-vec-shuffle-bug.ll

Differential Revision: http://reviews.llvm.org/D8259


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232179 91177308-0d34-0410-b5e6-96231b3b80d8
2015-03-13 17:29:49 +00:00
autoconf [autoconf] Fix the build failure by quoting the strings. 2015-03-12 19:56:25 +00:00
bindings Go bindings: use MDNode::replaceAllUsesWith instead of MDTuple::replaceAllUsesWith. 2015-03-05 22:55:38 +00:00
cmake Refactoring CMake CrossCompile module. 2015-03-12 17:33:34 +00:00
docs Updating GettingStarted documentation to reference CMake as the preferred way to build LLVM. 2015-03-13 01:58:14 +00:00
examples Fix the build of the gold-plugin and examples. 2015-03-04 19:15:29 +00:00
include Recommit r232027 with PR22883 fixed: Add infrastructure for support of multiple memory constraints. 2015-03-13 12:45:09 +00:00
lib [X86][AVX] Fix wrong lowering of v4x64 shuffles into concat_vector plus extract_subvector nodes. 2015-03-13 17:29:49 +00:00
projects Reverse the order libc++ and libc++abi are added in CMake. 2015-03-04 01:16:43 +00:00
test [X86][AVX] Fix wrong lowering of v4x64 shuffles into concat_vector plus extract_subvector nodes. 2015-03-13 17:29:49 +00:00
tools Reapply "[dsymutil] Gather function ranges during DIE selection." 2015-03-12 18:45:10 +00:00
unittests DataLayout is mandatory, update the API to reflect it with references. 2015-03-10 02:37:25 +00:00
utils Use the variable names from the TargetInstrInfo source when we 2015-03-13 01:26:39 +00:00
.arcconfig Updated phabricator server. 2014-04-07 03:57:04 +00:00
.clang-format Test commit. 2014-03-02 13:08:46 +00:00
.clang-tidy Enable display of compiler diagnostics in clang-tidy by default. 2014-10-29 17:29:38 +00:00
.gitignore Add one more vim swap file pattern 2015-01-30 21:59:28 +00:00
CMakeLists.txt Add new LLVM_OPTIMIZED_TABLEGEN build setting which configures, builds and uses a release tablegen build when LLVM is configured with assertions enabled. 2015-03-10 20:48:02 +00:00
CODE_OWNERS.TXT [CODE_OWNERS] Change the ownership of register allocators. 2015-03-05 22:15:17 +00:00
configure [autoconf] Fix the build failure by quoting the strings. 2015-03-12 19:56:25 +00:00
CREDITS.TXT Rise from the dead and update personal info 2014-08-25 17:51:04 +00:00
LICENSE.TXT Update for a new year. 2015-03-12 01:25:29 +00:00
llvm.spec.in
LLVMBuild.txt Remove the very substantial, largely unmaintained legacy PGO 2013-10-02 15:42:23 +00:00
Makefile [configure/make] Propagate names of build host tools when making BuildTools 2014-03-25 21:45:41 +00:00
Makefile.common Makefile.common: Update a description, s/Source/SOURCES/ , according to MakefileGuide.html#control-variables . 2012-12-07 01:43:23 +00:00
Makefile.config.in Add a check for misbehaving -Wcomment from gcc-4.7 and add 2014-11-05 00:35:15 +00:00
Makefile.rules Add support for SunOS function/data sections and associated 2015-03-03 20:54:29 +00:00
README.txt Revert test commit 2015-02-04 18:46:00 +00:00

README.txt 

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